TY  - JOUR
AU  - Sébastien Bize
TI  - The unit of time: Present and future directions
JO  - Comptes Rendus. Physique
PY  - 2019
SP  - 153
EP  - 168
VL  - 20
IS  - 1-2
PB  - Elsevier
DO  - 10.1016/j.crhy.2019.02.002
LA  - en
ID  - CRPHYS_2019__20_1-2_153_0
ER  -